This part is a kind of semiconductor called TPA3123.

Function of this product has Class-D Audio Amplifier Board Manual.

Manufacturers : Sure Electronics

Image and pinout :

Some of the text within the PDF file :

2*25W@4Ω TPA3123 Class-D Audio Amplifier Board User’s Guide © 2004-2009 Sure Electronics Inc. AA-AB018_Ver1.0 2*25W @4Ω TPA3123 CLASS-D AUDIO AMPLIFIER BOARD USER’S GUIDE Table of Contents Chapter 1. Overview ..1 1.1 1.2 1.3 1.4 1.5 Overview .. 1 Features ... 2 Applications. 2 Benefits . [ ... ]

TPA3123 PDF Datasheet Download